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1
Bring the pork bone broth to a steady simmer in a wide pot. Stir in the dissolved sweet potato starch in a slow, steady stream, stirring constantly. Continue to stir until the broth thickens to a silky, coating consistency that falls from a spoon in a smooth ribbon rather than running freely.
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2
Add the pre-cooked sliced pork intestine to the thickened broth and allow it to heat through over a gentle simmer, stirring occasionally, until the pieces are glossy and warmed to the centre — taste should show clean offal depth.
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3
Lower the mian xian into the simmering broth. The noodles are extremely delicate and will be ready in under 30 seconds; they are done when they have softened and are just tender with no raw resistance — remove from heat the moment this point is reached.
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4
In the final 30 seconds of noodle cooking, add the shucked oysters directly to the pot. They are done the instant their edges just begin to curl and their flesh turns from translucent to barely opaque — no further.
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5
Ladle immediately into warmed bowls, ensuring each portion receives broth, noodles, oysters, and intestine in equal measure. Serve at once — the noodles will continue to absorb the thickened broth if left to stand. Place black rice vinegar on the table; each diner adds a splash to their own bowl. The sharp acidity should lift and define the richness of the whole.